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After Toyota THS and BYD DM-i, hybrid has become the core keyword of new products by major manufacturers around the world. Starting in 2022, including the Great Wall Lemon DHT, Chery Kunpeng DHT, Geely Thor Hi · X, Changan iDD and many first-line independent brands will be deeply cultivated or set foot in the hybrid vehicle market, and all kinds of new products launched on this basis are also the focus of user attention, such as Han DM-i, latte DHT, Emgrand L Hi · X and so on.
In this context, GAC Trumpchi will naturally not be left behind. On April 26th, with the release of the new Yingku EMKOO mass production car, we saw for the first time the GMC2.0 hybrid technology independently developed by GAC Trumpchi, and this urban SUV model based on the GPMA architecture will undoubtedly become a heavy "hand".
Internal and external design dimensions, we will not repeat more, the official real car map, official map has been very complete display of the inside and outside details of this film cool.
In the author's aesthetic view, this car has a very obvious fashion movement tendency, including the use of LED light strips, semi-enclosed wheels, hidden door handles, etc. can reflect the "cool" word in the name of the Chinese, which is also popular among young people at present.
Today's focus is, compared with the 2.0TM+THS on the GS8 HEV, let's see what GMC2.0 hybrid system on GAC Trumpchi Yingku has in common with its predecessors? And, compared with the hybrid technology of domestic counterparts, what are the unique charms?
First of all, the engine part, the current domestic hybrid vehicle in the high-end hybrid vehicle is mostly based on the fuel vehicle 1.5T engine for electrification transformation, the cylinder block itself bore / stroke has not changed much, the piston stroke can not be too long, will affect the power response speed.
At the same time, these 1.5T engines are mostly Miller cycles with T, but the exhaust gas turbine will increase the intake pressure, considering the maximum pressure limit that can be tolerated by the compression stroke, the compression ratio can not be too high, 12:1 is already a very limit of the data, further improvement of the parts, oil, octane number will put forward higher requirements.
On the Trumpchi GMC 2.0, it is a 2.0ATK engine, its stroke bore ratio of 1.29 (the cylinder block is slender), which is a typical low-to-medium engine, with more emphasis on economy, so the longer the piston travel, the more conducive it is to squeeze the terminal kinetic energy of gasoline combustion.
The so-called "ATK" is actually the meaning of the Atkinson cycle, a cycle mode used to improve the compression ratio of the self-priming engine, and because the intake pressure of the self-priming engine is lower than the atmospheric pressure, it will not cause knocking problems after further increasing the compression ratio. The 2.0ATK on Trumpchi Shadow Cool has increased the compression ratio to an astonishing 15.6:1, and the thermal efficiency of the whole machine has reached 42.1%, which is the ceiling level in the self-priming engine.
To fully squeeze every drop of gasoline injected into the combustion chamber, the 2.0ATK also includes 350Bar common rail direct injection (enhanced gasoline atomization), GCCS combustion control (optimized mixed roll flow), EGR exhaust gas recirculation (residual gasoline re-combustion), and so on. In addition, new peripheral components such as electronic water pumps and variable displacement oil pumps allow the engine to more efficiently and accurately control cooling and lubrication, while also reducing the power shunt loss caused by accessories, so that the combustion power is more focused on power output.
In fact, these technological transformations are now the consensus of various brands to do hybrid special engines, after all, the engine of the hybrid vehicle only needs to output power at the highest thermal efficiency at a stable speed/load, and does not need to have a stable power output in all working conditions like the fuel vehicle engine. The functional appeal of the two is not the same, the direction of research and development is naturally different, the more general, the more can highlight the core advantages of the hybrid special engine - fuel saving.
Compared with the 2.0ATK engine, in fact, the electric drive module on the shadow cool is the technical core of GAC Trumpchi GMC 2.0. On the technical route, GAC Trumpchi still chooses the current mainstream dual-shaft dual motor + cancel the independent transmission scheme, which is the same as Toyota THS, BYD DM-i, Great Wall DHT, the most typical feature is that the side look at the electric drive module can see two circles, the inside of which is two motors on the two shafts, and others including IGBT electronic control, gear transmission, reducer are also integrated in this "box".
So the question is, without a transmission, how to achieve speed/torque balance, so that the car can get a stable output in the range of 0-120km/h? The answer is the role of the electric drive.
Great Wall DHT: Two circles, representing dual shafts and dual motors
Gilly Hi · X: A circle representing a coaxial dual motor
The motor parallel to the engine shaft is mainly responsible for driving and braking energy recovery, it can directly control the speed through the input power at low and medium speed, similar to pure electric cars that do not need a transmission at all; and in the medium and high speed working conditions or strong power demand conditions, the engine will be coupled to the electric drive system through two-stage gear speed, bringing more adequate power output; in addition, under low-speed working conditions and idle conditions, the engine is not completely intermittent, and the battery/motor is continuously powered by the coaxial generator.
Toyota THS: No gear shifting, coupled by planetary gears
Compared with the Toyota THS electric drive module on the GS8 HEV, we can see that its design ideas are more similar, but it is clear that GAC Trumpchi has not moved the hard sleeve, GMC2.0 still has a lot of original technology, such as the engine output has increased two-stage gear transmission, which is what Toyota THS does not have.
Its appearance can further balance the engine speed / torque, so that the engine can also be coupled to the power output (about 30km / h speed) at a stable speed of 3000rpm, strengthening the power performance of low and medium speed conditions, and if there is no such thing, the high speed / low speed mismatch, the engine will be stalled, similar to the manual second/ third gear start out.
In short, this kind of hybrid vehicle tube how do you step on the throttle, the engine is always running at its own pace, because the throttle does not directly control the throttle, the power demand is high, the power demand is low, the power is generated, there is no speed / load fluctuation, which is the most important reason for the fuel saving of this type of hybrid vehicle, and whether it can be charged by external power supply has nothing to do with it.
Obviously, fuel vehicles can not do this, to be strong when the engine will inevitably over-inject fuel to pull high speed, thermal efficiency will decline sharply, there is no hybrid vehicle energy recovery function, some are just engine brakes.
summary
On GAC Trumpchi Film Cool, we once again saw the fully autonomous domestic hybrid technology, smooth and fuel-saving, fast response, and no pick on road conditions, BYD DM-i, Great Wall DHT, Chery DHT, Geely Hi · X, plus Trumpchi GMC2.0, has these features and advantages, which further proves that this type of hybrid vehicle is becoming the "standard answer" for the development of future fuel vehicles.
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